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2008-i915-4-lane-quirk-for-mbp15-1.patch
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2008-i915-4-lane-quirk-for-mbp15-1.patch
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From 8a84123c2f8619a14f9fc493db2528e59fcc0db8 Mon Sep 17 00:00:00 2001
From: Orlando Chamberlain <[email protected]>
Date: Fri, 28 Jun 2024 04:43:50 +0000
Subject: [PATCH 8/9] i915: 4 lane quirk for mbp15,1
Needed to use iGPU when dGPU was boot GPU
Patch written by Kerem Karabay <[email protected]>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 4 ++++
drivers/gpu/drm/i915/display/intel_quirks.c | 15 +++++++++++++++
drivers/gpu/drm/i915/display/intel_quirks.h | 1 +
3 files changed, 20 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 3c3fc5337..c16e0b1d1 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4645,6 +4645,7 @@ intel_ddi_init_hdmi_connector(struct intel_digital_port *dig_port)
static bool intel_ddi_a_force_4_lanes(struct intel_digital_port *dig_port)
{
+ struct intel_display *display = to_intel_display(dig_port);
struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
if (dig_port->base.port != PORT_A)
@@ -4653,6 +4654,9 @@ static bool intel_ddi_a_force_4_lanes(struct intel_digital_port *dig_port)
if (dig_port->saved_port_bits & DDI_A_4_LANES)
return false;
+ if (intel_has_quirk(display, QUIRK_DDI_A_FORCE_4_LANES))
+ return true;
+
/* Broxton/Geminilake: Bspec says that DDI_A_4_LANES is the only
* supported configuration
*/
diff --git a/drivers/gpu/drm/i915/display/intel_quirks.c b/drivers/gpu/drm/i915/display/intel_quirks.c
index 14d5fefc9..727639b8f 100644
--- a/drivers/gpu/drm/i915/display/intel_quirks.c
+++ b/drivers/gpu/drm/i915/display/intel_quirks.c
@@ -59,6 +59,18 @@ static void quirk_increase_ddi_disabled_time(struct intel_display *display)
drm_info(display->drm, "Applying Increase DDI Disabled quirk\n");
}
+/*
+ * In some cases, the firmware might not set the lane count to 4 (for example,
+ * when booting in some dual GPU Macs with the dGPU as the default GPU), this
+ * quirk is used to force it as otherwise it might not be possible to compute a
+ * valid link configuration.
+ */
+static void quirk_ddi_a_force_4_lanes(struct intel_display *display)
+{
+ intel_set_quirk(display, QUIRK_DDI_A_FORCE_4_LANES);
+ drm_info(display->drm, "Applying DDI A Forced 4 Lanes quirk\n");
+}
+
static void quirk_no_pps_backlight_power_hook(struct intel_display *display)
{
intel_set_quirk(display, QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK);
@@ -201,6 +213,9 @@ static struct intel_quirk intel_quirks[] = {
{ 0x3184, 0x1019, 0xa94d, quirk_increase_ddi_disabled_time },
/* HP Notebook - 14-r206nv */
{ 0x0f31, 0x103c, 0x220f, quirk_invert_brightness },
+
+ /* Apple MacBookPro15,1 */
+ { 0x3e9b, 0x106b, 0x0176, quirk_ddi_a_force_4_lanes },
};
static struct intel_dpcd_quirk intel_dpcd_quirks[] = {
diff --git a/drivers/gpu/drm/i915/display/intel_quirks.h b/drivers/gpu/drm/i915/display/intel_quirks.h
index 151c8f4ae..46e7feba8 100644
--- a/drivers/gpu/drm/i915/display/intel_quirks.h
+++ b/drivers/gpu/drm/i915/display/intel_quirks.h
@@ -17,6 +17,7 @@ enum intel_quirk_id {
QUIRK_LVDS_SSC_DISABLE,
QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK,
QUIRK_FW_SYNC_LEN,
+ QUIRK_DDI_A_FORCE_4_LANES,
};
void intel_init_quirks(struct intel_display *display);
--
2.45.2